臺灣博碩士論文加值系統

本文以四種顆粒大小與WC添加多寡的商業用鎳基自熔合金粉末為基礎，經熔射後，以一大氣壓氮氣保護的條件對各塗層進行重熔處理，重熔溫度分別為950°C、1000°C與1050°C。為探討塗層經重熔後，晶粒組織與相態變化，並且找出塗層磨耗機制，從而找出最適合用在磨耗上的塗層，對各塗層進行各種物性分析、微硬度分析與磨耗試驗。
試驗結果顯示，經950°C重熔後，各塗層會趨向緻密，此時塗層的硬度與磨耗性質為相對最佳；相態變化方面，塗層在950°C時，Cr會析出，與C、B形成硬化相，Ni也與B形成硬化相，同時未熔融的Ni形成固溶體，隨著重熔溫度提高，晶粒會出現粗大化現象，造成孔洞增加，硬度下降；磨耗方面，各塗層經950°C重熔後，皆較未重熔時硬度下降，但抗磨耗性質卻較佳，添加WC的塗層其磨耗性會較佳，磨耗機制則以磨損、黏著與表面疲勞為主。
四種塗層中以TSM2002塗層經950°C重熔後為最佳，能得到一硬度超過700Hv、孔隙率低於1%，抗磨耗性佳的塗層。

This study focuses on the effects of the reflowing process on the physical properties、hardness analysis and wear test by four Ni-based self-fluxing alloy powders with different particle size mixed WC-Co powder by different weight ratio under reflowing temperature 950°C、1000°C and 1050°C by nitrogen in atmospheric pressure after thermal spray.
The results show that the dense coatings can be prepared and also exhibit good hardness and wear performance at reflowing temperature of 950℃. On the phase change, chromium increases the hardness of the coatings by the formation of hard phase with carbon and boron, nickel react with boron into a hard phase and the others change into Ni-solution. According to the elevated temperature, the hardness is decreased but the porosity is increasing because of the grain growth. On the wear resistance, each coating has worse hardness and better wears resistance, especially the coating adding WC-Co. The major wear mechanisms are based on abrasive wear、adhesive wear and surface fatigue. The TSM2002 coating after 950°C reflowing has the hardness which his more than 700Hv and exhibits the porosity under 1% which is the best coating with wearability among these four coatings.

摘要 i
ABSTRACT ii
誌謝 iv
目錄 v
表目錄 viii
圖目錄 ix
第一章 緒論 1
1.1 前言 1
1.2 研究目的與動機 3
第二章 文獻回顧 4
2.1 熔射基本原理 4
2.2 高速火焰熔射系統 5
2.3 高速火焰熔射塗層 7
2.3.1 塗層結構之特性 7
2.3.2 其他熔射製程塗層比較 9
2.4 自熔合金 12
2.4.1 重熔處理 13
2.4.2 相關專利探討 15
2.5 磨耗概念 16
2.5.1 摩擦(Friction)與磨耗(Wear) 17
2.5.2 磨損(Abrasive Wear) 17
2.5.3 沖蝕(Erosive Wear) 17
2.5.4 粘著磨耗(Adhesive Wear) 19
2.5.5 腐蝕磨耗(Corrosive Wear) 19
2.5.6 表面疲勞(Surface Fatigue) 20
第三章 實驗方法 21
3.1 實驗流程 21
3.2 實驗設備與參數設計 22
3.2.1 熔射粉末 22
3.2.2 熔射設備與參數 22
3.3 試片前處理與後處理 24
3.4 塗層物性分析 26
3.4.1 金相試驗 26
3.4.2 SEM微結構 26
3.4.3 XRD相態分析 27
3.4.4 EPMA分析 27
3.4.5 孔隙率試驗 27
3.4.6 結合強度試驗 28
3.5 硬度試驗 29
3.6 磨耗試驗 30
第四章 結果與討論 32
4.1 粉末分析 32
4.2 塗層結構分析 37
4.3 塗層孔隙率與鍵結強度分析 41
4.4 塗層相態分析 44
4.5 塗層SEM與EPMA分析 47
4.6 微硬度分析 56
4.7 磨耗分析 57
第五章 結論 67
參考文獻 69
作者簡介 73

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